Most LoRaWAN gateways assume two things that remote sites simply don't have: mains power and a wired internet connection. The Milesight SG50 throws out both assumptions. It is an all-in-one, solar-powered gateway with a built-in battery, 4G backhaul and GPS, sealed in an IP67 cast-aluminium enclosure — designed to drop a LoRaWAN network onto a hillside, a field or a well site with no electrician and no trenching. We put its specification and design under the microscope.
Specifications at a Glance
| Specification | Milesight SG50 |
|---|---|
| LoRa concentrator | Semtech SX1302, 8 half-duplex channels, −140 dBm sensitivity, 27 dBm Tx |
| Capacity | ~2,000 nodes (packet forwarder); built-in network server for up to 100 devices |
| Power | Monocrystalline solar panel (30 W or 45 W) + 3.6 V 25,000 mAh battery; 0.8 W typical; DC 12–24 V / USB-C for setup |
| Autonomy | Up to 4 days without sunlight (100 nodes @ 10-min interval) |
| Backhaul | 4G LTE Cat 1 / GSM (Nano SIM, 4FF); Wi-Fi 802.11 b/g/n (AP mode) for configuration |
| Positioning | Built-in GPS for location & remote management |
| Integration | MQTT, HTTP(s); Web / MQTT API / Milesight DeviceHub; OpenVPN client. Network servers: The Things Stack, ChirpStack |
| Enclosure | IP67 cast aluminium, −30 °C to +70 °C, 250 × 157.5 × 46 mm, 1.755 kg; wall/pole mount |
| Certifications | CE, FCC, RoHS |
What Stands Out
Genuinely off-grid power
This is the headline. An included monocrystalline panel charges a 25,000 mAh battery, and at just 0.8 W typical draw the gateway keeps running for up to four days with no sun at all. Milesight even varies the charge current with battery temperature to protect cell life. The 30 W panel suits typical conditions; the 45 W option harvests more for cloudier regions or busier networks. Critically, the gateway hardware is identical between variants — you're only choosing the panel.
A real 8-channel gateway, not a cut-down one
Off-grid often means compromised. Not here: the SG50 runs a full Semtech SX1302 with 8 half-duplex channels, −140 dBm sensitivity and 27 dBm transmit power, relaying around 2,000 nodes to a mainstream network server like The Things Stack or ChirpStack. For standalone sites it can run its own embedded network server for up to 100 devices, with listen-before-talk and packet filtering.
4G backhaul and GPS, no wiring
Independent 4G LTE Cat 1 / GSM cellular backhaul means no wired internet is required — drop in a Nano SIM and the gateway is online. Built-in GPS reports location and simplifies fleet management, while Wi-Fi in AP mode handles on-site configuration from a phone or laptop. Remote management runs through Milesight's DeviceHub / Development Platform, with an OpenVPN client for secure access.
Built for the field
The IP67 cast-aluminium body shrugs off rain and dust and runs from −30 °C to +70 °C. The box ships as a deployable kit — gateway, battery pack, panel and bracket, antenna and coax, plus wall and pole mounting hardware and hose clamps — so a single technician can install it in well under an hour. (A Nano SIM isn't included.)
Where It Earns Its Keep
The SG50 is purpose-built for places the grid doesn't reach: well sites, pipelines and remote mining; fields, farms and forests for soil, climate and environmental sensing; and off-grid utilities and infrastructure where GPS doubles as asset location. Its all-in-one solar design also makes it a natural fit for temporary networks — pilots, disaster response and seasonal sites — where running power would be slow or impossible. If that sounds like forest monitoring, our Florina smart-forest case study shows the same off-grid principles in action.
Pros & Cons
How it works
One sealed box, completely off-grid
The SG50 removes the two things remote sites never have — mains power and wired internet. Solar runs it; 4G connects it; LoRa reaches the sensors.
SG50 vs the Rest of the Range
The SG50 isn't a do-everything gateway — it's a specialist. Here's how to choose between it and Milesight's mains-powered options:
| Your site | Best fit |
|---|---|
| No mains power, remote outdoor | SG50 (this review) — solar + 4G, fully autonomous |
| Powered outdoor / industrial | UG67 — IP67 outdoor gateway with mains/PoE and 4G/GNSS |
| Indoor / building with BMS | UG65 or EG71 — add Modbus/BACnet for building-system integration |
The Verdict
For the job it's built for — putting a capable, standards-based LoRaWAN gateway somewhere with no power and no wired internet — the SG50 is hard to beat. It removes the two biggest blockers to remote IoT in a single rugged, well-equipped package, and it doesn't cut corners on the radio. As long as you have cellular coverage and don't need Modbus/BACnet, it's an easy recommendation for off-grid agriculture, environmental, utility and industrial monitoring. A deserved 4.5 / 5.
Frequently Asked Questions
What's the difference between the 30 W and 45 W versions?
Only the included solar panel differs. The 30 W (SP1530) is the default for typical sunlight; the 45 W (SP1545) harvests more energy for lower-light regions or higher node counts. The gateway itself is identical.
How long does it run without sunlight?
Up to four days on its 25,000 mAh battery (100 nodes at a 10-minute report interval), thanks to typical consumption of just 0.8 W.
How does it connect to the internet?
Through 4G LTE Cat 1 / GSM cellular backhaul using a Nano SIM (4FF) — no wired internet needed. Wi-Fi (AP mode) is used only for on-site configuration. A SIM is not included.
How many devices does it support?
It relays around 2,000 nodes to an external network server in packet-forwarder mode, and runs a built-in network server for up to 100 devices for standalone sites.
Does it support BACnet or Modbus?
No — the SG50 integrates over MQTT and HTTP(s). For BACnet/Modbus building-system integration, choose the Milesight UG56, UG65 or EG71 instead.
Planning an Off-Grid LoRaWAN Network?
Tell us about your site and our engineering team will help you size the SG50, its solar panel and the sensors to pair with it — pre-configured and ready to ship.